Window units are very common in Columbus. I own several rentals in Linden with a mixture of AC installed vs not installed. Also, tenants will often times already have their own washer & dryer units and would rather use those instead of owner supplied W&D.
Example:
1 -Single family - central air already installed when I purchased & I provided washer & dryer units.
2- Duplex - no central air installed and washer & dryer units are provided by the tenants. I've kicked around installing AC but still manage to get renters applying to live there before I pull the trigger on installing AC.
3 - 2nd Duplex - I installed central air after purchasing the property for inherited tenants but they've used their own W&D units for years.
Yes, it makes it more appealing to tenants searching for a place to stay, but you can always add AC / used washer & dryer units later on in order to make the unit more appealing.
At the end of the day, I'd say it's more of a personal preference. They can also be another item that will need maintenance / replacements if they break down.